xiaobat

code
(
@echo off&setlocal enabledelayedexpansion
set str=I love,bbs;bathome.net
set k=0
for %%x in (%str%) do (set z=%%x&&set a=!z:.= !&&for %%b in (!a!) do (set /a k+=1&&if !k! equ 5 echo %%b))
pause>nul
)
输出：
net
如题要输出cn,只要把上面代码"echo %%b"改成"echo cn"

xiaobat

@echo off&setlocal enabledelayedexpansion
set str=I love,bbs;bathome.net
for %%x in (%str%) do (set z=%%x&&set a=!z:.= !&&for %%b in (!a!) do echo %%b)
pause>nul

输出：
I
love
bbs
bathome
net
不知，楼主是否题目有问题，那来的cn,如是要有cn ,只能加个IF语句了

634175535

玩的不是批处理玩的是寂寞呐

newborenee

setlocal enabledelayedexpansion  的作用域到哪啊？

newborenee

　　A1：假设令 set str=I love,bbs;bathome.net，请分别显示出I、love、bbs、bathome和cn这五个字符串。目的：了解for语句用到了哪些符号作为元素的分隔符。
   for /f "delims= ,;." %i  in ('call %%str%%') do @echo %i

　　A2：条件同A1，要求最后只显示cn这个字符串。目的：了解for语句的执行流程。
    for /f "delims= ,;. tokens=*" %i  in ('call %%str%%') do @echo %i

bi1_1

@echo off
set str=I love,bbs;bathome.net
set str=%str:.net= cn%
for %%i in (%str%) do echo %%i
pause
复制代码

@echo off & setlocal enabledelayedexpansion
set str=I love,bbs;bathome.net
set /a i=0
set str=%str:.net= cn%
for %%i in (%str%) do (
set /a i+=1
if !i!==5 echo %%i
)
pause
复制代码

pingdan

我是新来的，刚开始学批处理。

mlrw923

第二题这样算么？
@echo off
set str= I love,bbs;bathome.net
for  %%i in (%str%) do set a=%%i
cls
echo %a%
pause>nul

zhang2dong112

@echo
for %%I in (I love bbs bathome.net) do %%I
pause

yangsl1988

@echo off
set str=I love,bbs;bathome.net
for /f "tokens=1-5 delims=,;=" %%a in ("%str%") do echo %%a %%b %%c %%d %%e
pause

lvyaojian

1.

@echo off
set str=I love,bbs;bathome.net
for %%i in (%str%) do echo %%i
pause
复制代码

2.

@echo off
set str=I love,bbs;bathome.net
for %%i in (%str%) do (if %%i=cn echo %%i)
pause
复制代码

wsjxwj

::A1
@echo off
set str=I love,bbs;bathome.net
for %%a in (%str%) do echo %%a
pause>nul

::A2 单纯的for加if条件判断语句
for %%a in (%str%) do (if %%a==cn echo %%a)
pause>nul



::for 加"/f" 和"delims tokens"的用法
for /f "delims== tokens=2" %%a in ("%str%") do echo %%a

nuifv12

A1:
@echo off
set str=I love,bbs;bathome.net
for %%i in (%str%) do echo %%i
pause>nul

A2：
@echo off
set str=I love,bbs;bathome.net
for %%i in (%str%) do echo %%i >1.txt
type 1.txt
del 1.txt
pause>nul

gbw911

@echo off
set str=l love,bbs;bathome.net
for %%i in (%str%) do echo %%i
pause>nul
复制代码

bjjgq

A1：
@echo off
set str=I love,bbs;bathome.net
for %%i in ("%str%") do echo %%i
pause
A2：
@echo off
set str=I love,bbs;bathome.net
for  %%i in ("%bathome%") do echo %%i
pause

[ 本帖最后由 bjjgq 于 2009-12-2 15:32 编辑 ]